Drum stop and gripper actuator for duplicating apparatus



INSON 2,558,157 P ACTUATOR ARATUS June 26, 1951 G. R. R

DRUM STOP AND FOR DUPLICATING 4 Sheets-Sheet 1 Filed July 5, 1946 Win? June 26, 1951 e. R. ROBINSON DRUM STOP AND GRIPPER ACTUATOR FOR DUPLICATING APPARATUS 4 Sheets-Sheet 2 Filed July 5, 1946 June 26, 1951 G. R. ROBINSON 2,558,157

DRUM STOP AND GRIPFER ACTUATOR FOR DUPLICATING APPARATUS 4 Sheets-Sheet 3 Filed July 5, 1946 Dyer/Tor June 26, 1951 e. R. ROBINSON DRUM STOP AND GRIPPER ACTUATO FOR DUPLICATING APPARATUS Filed July 5, 1946 4 Sheets-Sheet 4 InvenTor Patented June 26, 1951 DRUM STOP AND GRIPPER ACTUATOR FOR DUPLICATING APPARATUS Grant B. Robinson, Melrose, Mass, assignor, by direct and mesne assignments, to Old Town Ribbon & Carbon 00., Inc., of Mass, a corpo ration of Massachusetts Application July 1946, Serial No. 681,540

8 Claims.

This invention relates to an improvement in duplicating machines and is particularly" adapted to be embodied in a duplicating machine of the type wherein master copy sheets are employed and the copy sheets to be duplicated upon are moistened with a suitable solvent for the ink or carbon on the master sheet and then brought into contact, under pressure, with the master sheet so that the matter carried on the master sheet will be transferred to the copy sheets.

The master sheets have the matter to be duplicated written or typewritten in reverse so that when a portion. of the carbon or ink is dissolved and transferred to the moistened surface of the copy sheet, it will appear in correct readable form.

One form of the invention is embodied in a duplicating machine of the type described which includes a rotary drum having means for clamping a master sheet thereto. Feeding and moistening rollers advance the copy sheets to the duplicating drum, and a pressure roller engages the copy sheets with the master sheet to effect the duplicating operation. Power driven means are provided for rotating the duplicating drum and for operating the mechanism associated with the machine. The source of power is continuously operated and the machine operator controls its. connection for driving the machine mechanism in a manner that, if so desired, the machine comes to a complete stop at a determinate registering point at the end of each cycle of operation and will not proceed with the next cycle of operation until the machine operator has caused the. power driven. means to become functionally operative. Also, if the operator so desires, the power driven means may be connected to functionally operate the machine mechanism for continuous cycles of operation and wherein the feed rolls are intermittently operated so that a copy sheet maybe positioned and automatically advanced to register for engagement with the master copy on the printing drum.

The improved machine. also includes a combined master sheet clamp opening and drive disconnecting means that causes the drum to be stopped and the clamp simultaneously opened in a convenient. position in the normal path and direction of rotation of the drum and upon the closing of the clamp causes the drum to be rotated and stopped at its registering position for the beginning of an operative cycle of the machine.

Other featuresand advantages of the invention will become apparent from the following description of a preferred form of the invention as 11- lustrated in the accompanying drawings and forming a part hereof and wherein- Fig. 1 is a side elevation of a duplicating ma.- .chine having the present invention embodied therewith.

Fig. 2 is a sectional elevation taken substantially along line '22, Fig. 1.

Fig. 3 is a. view corresponding substantially to Fig. 2 but shows some of the parts in a different position.

Fig. 4 is a fragmentary view showing the clutch actuator release lever and drum brake.

Figs. 5 and 6 are viewsv corresponding substantially to Fig. 4 but each view shows some of the parts in different positions.

Fig. 7 is a fragmentary view showing the master copy sheet clamp actuating device.

Fig. 8 is a view taken substantially along line 8-8, Fig. 3.

Fig. 9 is a section taken substantially along line 9-9, Fig. 2, and

Fig. 10 is a longitudinal section on line 10-40} 5 along ll-ll, Fig. 1, and

Fig. 12 is a view corresponding substantially to Fig. 11 but shows the parts in a different position.

The duplicating machine The illustrated duplicating machine is provided with a base [I] and. opposed side frames [0a. that rotatively support a drum shaft H to which the printing drum I2 is secured. This printing drum I2 is provided with a suitable master sheet clamping bar [3 disposed in a longitudinal. recess or seat formed in the peripherial face of the drum. Tension springs 14 urge the clamp bar [3 to a seated or closed position with its outer face forming a part of the drum face. In this instance a rockable rod 15 extends lengthwise within the drum l2 and is suitably supported in the opposed end walls of the drum. Contact: elements l6 are fixed to the rod l5 and have a bearing against the inner face of the clamp bar i3. One end of the rod [5 extends beyond the drum wall and has a lever l 1 secured thereto by which the rod' [5 may be rocked. to effect. an opening of the clamp bar l3 so that an end of amaster copy sheet A may be disposed between the clamp faces Ha, Ha.

A bracket I8 is disposed between the side frames Illa and supports a pressure roll l9 that coacts with the drum face so that copy sheets to be duplicated upon are engaged under pressure with the master copy as the drum is rotated. Opposed feed roll-s :01, 2| are rotatably mounted in the bracket and these rolls are intermittently operated in a timed relation to the drum by gearing (not shown) or other suitable instrumentalities. A moisteningdevice 22 applies moisture to the face of one of the feed rolls 2! and this moisture is transferred to the face of a copy sheet as a copy sheet is fed from the sheet stack support 23 to be engaged by and between the feed rolls 20, 2! and advanced to register with the master copy in the bight formed by the drum I2 and its coacting pressure roll [9.

The machine drive A motor 24 is mounted within the machine frame and is provided with suitable connections adapted to continuously rotate a driving pulley 25 secured to a clutch housing 26 that is freely rotatable on the drum shaft II. This clutch housing 26 is provided with a chamber 26a in which is disposed a sleeve 2'! that is secured to the drum shaft ll. The'sleeve ZT'is of a less diameter than the diameter'of the housing chamber and is provided with faces Zia adapted to engage with spaced apart clutch rolls 28. Freely supported on the drum shaft H is an actuator 29 having a plurality of integral sections 29a extending into the clutch housing chamber 26a with the sections disposed between the clutch rolls 28. A collar 36 is disposed adjacent to the clutch actuator 29 and is secured to the shaft. Disposed between the shaft collar 30 and the clutch actuator 29 is a torque spring 3! having one end in engagement with the collar 30 and its opposed end in engagement with the actuator 29. This torque spring continuously urges the actuator 29 in the direction of the arrow, Fig. 9 to cause the clutch rolls 28 to be moved into a wedging action between the inner face of the housing chamber 26a and the shaft sleeve faces 21a in a manner that locks the shaft sleeve 2'! in a driving relation with the clutch housing 23.

The machine drive control to the drum 12. The control lever 33 is urged upwardly into or biased toward its normal operative position by means of a spring 35 having one end attached to the lever 33 and its op-' posite end secured in a fixed stud 3'1. Upward movement of the control lever is adjustably limited by means ofa threaded screw 38 supported in a fixed projection 39.

' At Fig. 1 the control lever 33 is shown in its normal operative position with the lever projection 33a in engagement with and restraining the clutch actuator pin 2% thus causing the actuator sec-' tions 29a to act in a direction contra to the arrow,

Fig 9, to urge the clutch rolls 28 from their wedging and driving relation between the inner face of the clutch housing chamber 26a and the shaft sleeve faces 27a thus permitting the clutch housing 26 to be freely rotated while rotary movement of the shaft sleeve 21 and its associated shaft II is arrested.

To obtain a single cycle of operation of the printing drum [2 the operating lever 33 is depressed as shown at Fig. 4 releasing the actuator pin 2% thus permitting the torque spring 3! to urge the clutch rolls 28 into their driving relation between the revolving clutch housing 26 and the clutch sleeve 27. After the actuator pin 29 is released the spring 35 returns the lever 33 to its operative position, Fig. 5, with the lever engaging projection 33a disposed in the path of the actuator pin 2% and the brake lever 34 in the path of the drum brake shoe 420. The opposed engaging faces of the brake lever 34 and shoe I20 are preferably arranged so that a slight wedging action is effected as the two members fully engage prior to engagement of the control lever projection 33a with the clutch actuator stop pin 2% so that movement of the drum is arrested in a determinate stop position upon completion of an operative cycle. The brake shoe I20 is located on the drum in such position that it is engaged by the shoe 34 to frictionally resist rotation of the drum when the actuator shoulder 29b approaches engagement with the shoulder 33a carried by the lever 33. The function of the brake is to check the speed of the drum and eliminate shock as the shoulder 29b approaches the shoulder 33a and the brake furthermore serves the function of holding the drum against rotation after it has been broughtto the stop position.

When continuous rotation of the drum [2 is desired the operating lever 33 is depressed and locked in its depressed position, Fig. 6, by means of a latch lever 4!! that is rockably supported on a fixed pivot 4|. To arrest rotation of the drum 42, the latch lever 40 is moved to its normal inoperative position, Figs. 1 and 4, which permits the control lever 33 to return to its operative position and arrest the clutch actuator 29 and drum l2 at the completion of an operative cycle as above described and in its registering position.

The present arrangement also provides a stop position for the drum l2 intermediate its operat ing cycle and registering stop position so that the master sheet clamp can be disposed in a more convenient position for an operator to insert the master sheet A. To accomplish this purpose a combined clamp and clutch control lever 42 is rockably supported on a stationary pivot 43 and extends thru a slot too in the side frame. This lever 42 is retained in its operative or inoperative positions by means of a pivoted yielding latch 44. An arcuate cam 45 is associated with the control lever 52 and is disposed in the path of the clamp lever roll 46 when the lever 42 is in its operative position. A clutch actuator pin stop projection 4'! is carried by the control lever 42 and is disposed in the engaging path of the clutch actuator pin 2% when the cam 45 is positioned to open the master clamp bar I3 so that 'rotative movement of the drum I2 is arrested simultaneously with the opening of the clamp bar.

When a master sheet end A has been positioned between the opposed clamping faces lZa, [3a, Fig. 7, the control lever 42 is moved to the right, see Figs. 2 and 3, and the face of the cam 45 is first disengaged from the clamp lever roll 45 and the clamp bar I3 is urged to its closed position by the springs i4 thus securing the marginal edge of the master sheet A to the drum. As the control lever is further moved to the right, the actuator pin stop 4: is disengaged from the actuator pin 2% in sequence with the clamp closing and the actuator 29 operatively engages the clutch elements in a driving relation until the actuator pin 29?) is in sequence engaged by the drive control lever projection 33a and rQtative movement of the drum l2 arrested in its registering stop position and ready to begin another operative cycle of the machine.

The present structure further permits the use of a master copy of a length corresponding substantially to the circumference of the drum. In this instance the leading edge of the master copy is clamped to the drum with the clampin its usual master changing position, '7. It is obvious that after using a full length master the rear end of the master sheet may be engaged between the drum I2 and pressure roll l9 with its clamped end in the registering stop position of the drum when a change of the master copy sheet is desired. To accomplish this function, the clamp opening lever cam 45' that is normally out of the path of the clamp lever roll 45, Fig. ll, during the operative cycle of the drum is manually moved to the left, when the drum is at rest, and engages the clamp lever roll 48 in a manner that-rocks the clamp bar l3 to separate the clamp engaging faces i2a, like to release the master leading edge therefrom. The released end of the master copy sheet permits the sheet, to be removed from the face of the drum and laid into the sheet receiving tray (not shown) while its rear end is engaged between the drum and pressure roll 19. When the drum is next rotated the engaged rear end will be released and the master copy sheet discharged into the receiving tray.

While the form and arrangement of parts as shown in the drawings as above described are preferred, the invention is not to be limited to such form and arrangement except so far as the claims may be so limited, it being understood that changes might well be made in the form and arrangement of the parts by those skilled in the art without departing from the spirit and scope of the invention and in which it is the intention to claim all novelty inherent in the invention as broadly as possible in view of the prior art.

What I claim is:

1. In a duplicating machine, a printing drum, power driven means, clutch elements respectively connected to the drum and power driven means, means including a clutch actuator normally connecting said elements to drive the drum, a manually operable member movable to and from a position to engage and render the actuator inoperative at the end of a complete rotation of the drum, cooperating stop shoulders carried by the actuator and the manually operable member for thus rendering the actuator inoperative, and means connected to and operable by the manually operable member and releasably engageable with the drum for frictionally resisting rotation of the drum when the actuator shoulder approaches engagement with the other shoulder.

2. The duplicating machine defined in claim 1 in which the last named means includes an arcuate brake shoe carried by the drum and a cooperating and relatively fixed brake shoe connected to the manually operable member and movable therewith toward the drum to a position to frictionally engage the first named brake shoe.

3. In a duplicating machine, a printing drum, power driving means therefor, two rotary and coaxial clutch elements connected respectively to the drum and the power driving means. a plurality of rolls arranged in spaced relation between said rotary elements, a spring-loaded clutch actuator cooperating with said rolls normally to connect said elements to drive the drum, a manually operable member movable to and from a position to be engaged by and. render the actuator inoperativeat the. endof a completerotation of the drum, cooperating stop shoulders carried by the actuator and the manually operable member, a brake shoe carried by the drum, and connections to said manually operable member for frictionally engaging the brake shoe when the actuator shoulder approaches engagement with the other shoulder.

4. In a duplicating machine, a printing drum,

power driven means, clutch elements respectivelyment with the drum, means for lifting the. grip per from such engagement, a pivoted lever, a cam carried by the lever and movable therewith into and from a position to be engaged by the. lifting means and lift the gripper, and stop meansv carried by the lever and movable therewith to a position to be engaged by and render the actuator inoperative when the cam is in its gripper lifting position.

5. The duplicating machine defined in claim. 4 in which the camand stop means are so relatively positioned that upon retracting movement of the lever the cam releases the gripper lifting means in advance of release of the actuator by said stop means.

6. In a duplicating machine, a printing drum, power driving means therefor, two rotary and coaxial clutch elements connected respectively to the drum and the power driving means, a plurality of rolls arranged in spaced relation between said rotary elements, a spring-loaded clutch actuator cooperating with said rolls normally to connect said elements to drive the drum, a manually operable member movable to and .from a position to be engaged by and render the actuator inoperative at the end of a complete rotation of the drum, a sheet gripper carried by and extending longitudinally of the drum, means normally holding the gripper closed in sheet gripping engagement with the drum, means for lifting the gripper from such engagement, a ivoted lever, a cam carried by the lever and movable therewith into and from a position to be engaged by the lifting means and lift the gripper, and stop means carried by the lever and movable therewith to and from a position to be engaged by and render the actuator inoperative.

7. In a duplicating machine, a printing drum, means for rotating said drum, clutch elements respectively connected to said drum and said drum-rotating means, means including a clutch actuator normally releasably connecting said elements to drive the drum, a manually operable member having a part movable to and from a position to operate said clutch actuator to release the connection between said clutch elements at the end of a complete rotation of said drum, sheet-clamping means carried by said drum and movable thereon from a sheet-clamping position to a sheet-releasing position, and a second manually operable member movable from a retracted position to a projected position to releasably engage said clamping means for moving the latter to said sheet-releasing position thereof, said second manually operable member having a part releasably engageable with said clutch actuator, when said clamping means is released, for operating the clutch actuator independently of said first manually operable member to release the connection between said clutch elements in a predetermined position of said drum before one rotation of the drum is completed, together with means normally biasing said first manually operable member to its said clutch-releasing position and a releasable device to prevent said biasing means from moving said manually operable member to clutch-releasing position.

8. In a duplicating machine, a printing drum, means for rotating said drum, clutch elements respectively connected to said drum and said drum-rotating means, means including a clutch actuator normally releasably connecting said elements to drive the drum, a manually operable member having a part movable to and from a position to operate said clutch actuator to release the connection between said clutch elements at the end of a complete rotation of said drum, sheet-clamping means carried by said drum and movable thereon from a sheet-clamping position to a sheet-releasing position, and a second manually operable member movable from a retracted position to a projected position to releasably engage said clamping means for moving the latter to said sheet-releasing position thereof, said second manually operable member having a part releasably engageable with said clutch actuator, when said clamping means is released, for operating the clutch actuator independently of said first manually operable member to release the connection between said clutch elements in a predetermined position of said drum before one rotation of the drum is completed, said clutch actuator being arranged to turn with said drum when said clutch elements are connected and being provided with spring means which operates said actuator to connect said clutch elements with a part for moving said actuator in opposition to said spring means to release said clutch elements for interrupting the rotation of said drum, the said parts of the two manually operable members being movable into positions spaced from each other in the direction of drum rotation for respectively engaging said parts of the actuator to release the clutch elements.

GRANT R. ROBINSON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,639,053 Northrop Aug. 16, 1927 2,069,729 Storck Feb. 2, 1937 2,117,165 1 Hernlund May 10, 1938 2,216,593 Marchev et a1. Oct. 1, 1940 2,220,282 Ritzerfeld Nov. 5, 1940 2,277,967 Gibson Mar. 31, 1942 2,373,503 Sager et a1 Apr. 10, 1945 2,421,823 Allen et a1 June 10, 1947 

